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An image pyramid basically makes it possible to get the image data at different resolutions. A good intro explanation is here:
scroll down to the animated gif.
Thanks. As a film user,I don't know if I'll ever make use of it,but as it's after 9pm over here,I'll study the website you quoted in greater detail tomorrow.
I've not found reference to it on the forum,so does that mean it's of limited use ?
It's one of those things you don't need to worry about. If you need it, you know you do.